Redirect to first available variant if out of stock variable is selected in url.

[zainmirza60]

We are facing the bug with out of stock items when customer select the out of stock items by url like below:

https://www.exportleftovers.com/collections/mens-casual-shirts/products/polo-republica-mens-signatur... 

then other variables are also not showing. We have stock of other variants which should show. Please let me know why variant is not fetching the first available variant if out of stock is selected by customer via url. 

Please see the video to make it clearer.

https://www.screencast.com/t/mnYqpFgo

Thanks!

Zain